JPH058363Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a power transmission belt.

(b) Conventional technology As a conventional power transmission belt, for example, JP-A-61-
There is one shown in Publication No. 236946. This power transmission belt is constructed by assembling a large number of friction blocks to a chain constructed by connecting two types of link plates. One link plate is provided with a total of four convex portions, two on each side, and the other link plate is provided with concave portions corresponding to the convex portions.
A chain is constructed by alternately arranging these two types of link plates.

(c) Problems to be solved by the invention However, the conventional power transmission belts mentioned above have the problem that it is practically difficult to mass produce them, resulting in extremely high prices. There is a point. That is, one of the link plates has convex portions at the same position on both sides of the link plate, and it is practically impossible to process the convex portions with a press. Therefore, it is necessary to use a sintering method or the like, resulting in a high price. Furthermore, since it is necessary to prepare two types of link plates and assemble them alternately, the assembly workability is poor and this is not preferable in terms of production control. The present invention aims to solve these problems.

(d) Means for solving the problems The present invention solves the above problems by using one type of link plate and by making the link plate into a shape that can be press-formed. That is,
In the power transmission belt according to the present invention, the chain is composed of one type of link plate, and the link plate has two convex portions provided on one surface and two concave portions provided on the other surface. and
The concave part and the convex part are arranged so that their center positions coincide, and the two concave parts and the convex part are arranged in symmetrical positions with respect to the center of the link plate. It is possible to fit into the convex part and the concave part of the link plate, respectively, and the dimensions between the two convex parts are such that a friction block can be inserted between them, and the chain can fit such a link plate. The chains are stacked in multiple rows and connected in an endless manner, and the outermost link plates of the chain are arranged with the convex portions facing outward.

(E) Function The link plates are basically arranged in the same direction and connected by fitting the convex part of one link plate into the concave part of the other link plate. In this case, the two protrusions of one link plate fit into the recesses of the other link plate. The convex portions of two other link plates are fitted into the concave portion of one link plate. In this way, multiple rows of link plates are overlapped and connected endlessly. Note that the link plates in the last row are arranged with their faces reversed so that the convex side faces the outer end of the chain. The link plates in this last row and the adjacent link plates are in a state where the recesses match, but a connecting piece may be attached here to connect them, or they are not necessarily connected. You can.
A friction block is assembled to the chain thus constructed. The friction block is sandwiched between the protrusions of the outermost link plate. This allows the friction block to swing a predetermined amount using the protrusion of the link plate as a fulcrum.

(F) Embodiment FIG. 5 shows a power transmission belt 10 according to the present invention.
The transmission belt 10 is composed of an endless chain 12 and a large number of friction blocks 14 assembled to the endless chain 12. The chain 12 is constructed by connecting a large number of link plates 16.

The link plate 16 has a shape as shown in FIGS. 2 and 3. That is, both ends of a rectangular plate are semicircular, with cylindrical convex portions 18 and 20 formed on one surface, and cylindrical concave portions 22 and 24 formed on the other surface. Convex portion 18 and concave portion 2
2 are provided at the same position on the back surface and the front surface of the link plate 16, and the convex portion 20 and the concave portion 2
4 is also provided at the same position. Further, the positions of the convex portion 18 and the concave portion 22 and the positions of the convex portion 20 and the concave portion 24 are arranged symmetrically with respect to the longitudinal center line of the link plate 16. Further, the dimension between the mutually facing portions of the convex portion 18 and the convex portion 20 is made equal to the thickness dimension of the friction block 14. The diameters of the protrusions 18 and 20 are slightly smaller than the diameters of the recesses 22 and 24, so that they can fit into each other. This link plate 16 is made by press processing, and the recesses 22 and protrusions 18, and the recesses 24 and protrusions 20 are formed by pushing in cylindrical projections of a press mold from the recesses 22 and recesses 24 sides, respectively. processed at the same time. Link plate 16 shaped like this
As shown in FIG. 1, they are stacked in multiple rows and connected endlessly. That is, the arrangement of the link plates 16 in the second row 28 is shifted by 1/2 pitch from the arrangement of the link plates 16 in the first row 26.
The convex portion 20 of the link plate 16 on the second row 28 side fits into the convex portion 24, and the convex portion 18 fits into the concave portion 24. Similarly, the third column 30 is
It is offset by 1/2 pitch relative to column 28 (i.e.
The pitch is the same as the first row 26). Furthermore, the 4th column
32 is also shifted by 1/2 pitch with respect to the third row 30 (ie, the same pitch as the second row 28). For the next 5th column 34, the above 1st column 26 and 2nd column
28, 3rd row 30 and 4th row 32 are link plate 1
The direction of the side 6 is reversed. This fifth column 34
The arrangement pitch is the same as that of the first column 26 and the third column 30. In addition, in order to assemble the link plate 16 of the fifth row 34 to the link plate 16 of the fourth row 32, a cylindrical connecting piece 36 having the same diameter as the convex parts 18 and 20 is attached to the link plate 16 of the fourth row 32 and the fifth row. It is fitted into the recesses 22 and 24 of the link plates 16 of row 34. In this way, five consecutive rows of link plates 16 are made endless, and each convex portion 18
A friction block 14 is assembled between the convex portion 20 and the convex portion 20. The friction block 14 has five parts as shown in FIG.
It has a groove 38 for receiving the link plate 16 of the column, into which the link plate 16 is inserted;
Next, the friction block 14 is attached to the chain 12 by closing the open side of the groove 38 with a retaining member 40. The retaining member 40 is attached to the friction block 14 by, for example, press fitting. By doing so, a large number of friction blocks 14 are sequentially assembled onto the chain 12. The friction block 14 becomes swingable using the protrusions 18 and 20 of the link plate 16 as fulcrums.
The friction block 14 has tapered cross sections 42 and 44 for contacting the V-shaped grooves of the pulley.
Note that this transmission belt 10 is used by being wound around two pulleys 52 and 54, as shown in FIG. The pulleys 52 and 54 have fixed conical members 52a and 54a, respectively, and movable conical members 52b and 54b, thereby forming conical surfaces 32 and 34 and conical surfaces 32' and 34' facing each other. ing. As mentioned above, the friction block 14 has tapered sections 42 at both left and right ends.
and 44, and these tapered cross sections 42 and 44 form conical surfaces 32 and 34 (or conical surface 3
2' and 34'), respectively.

Next, the operation of this embodiment will be explained. When transmitting rotational force, the friction block 14 receives a compressive force from the conical surfaces 32 and 34 or 32' and 34'. Force is transmitted between the pulley 52 or 54 and the transmission belt 10 by the frictional force between the tapered sections 42 and 44 and the conical surfaces 32 and 34 generated by this compressive force.

The force acting on this friction block 14 is transmitted via the chain 12. The link plates 16 composing the chain 12 have a convex portion 18 and a concave portion 2.
4, and the convex part 20 and the concave part 22 are fitted into each other, and can be swung about this as a fulcrum, so that it can bend as shown in FIG. 5 along the V-shaped groove of the pulley. Further, the friction block 14 also swings according to the bending of the chain 12.
Smooth transmission of rotational force is achieved.

The link plate 16 is manufactured as described above.
It can be performed by a simple process of press working, and mass production is possible at low cost. In addition, since the chain 12 is constructed using link plates 16 of the same shape, the work of managing many types of parts and selecting and assembling them alternately becomes unnecessary, and the assembly work is greatly reduced. Streamlined. In addition, in the above-mentioned embodiment, the connecting piece 36 was used to connect the link plate 16 in the fourth row 32 and the link plate 16 in the fifth row 34.
Since the positions of the link plates 16 in the row 34 are regulated by being assembled to the friction block 14, the connecting piece 36 may be omitted.

(g) Effects of the invention As explained above, according to the invention, two protrusions and two recesses are provided at the same position on both sides of the link plate, and the chain is connected by using these protrusions and recesses. As a result, link plates can be mass-produced efficiently by press working, and a chain can be constructed from one type of link plate, simplifying the manufacturing process. You can get a low-cost power transmission belt.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a power transmission belt according to an embodiment of the present invention, Fig. 2 is a diagram showing a link plate, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a diagram showing a transmission belt according to an embodiment of the present invention.
5 is a side view of the power transmission belt shown in FIG. 1, and FIG. 6 is a diagram showing the state in which the power transmission belt is used. 10...Transmission belt, 12...Chain, 14
...Friction block, 16...Link plate, 1
8, 20... Convex portion, 22, 24... Concave portion.

Claims (1)

[Claims for Utility Model Registration] A power transmission belt consisting of a chain constituted by connecting a plurality of link plates and a number of friction blocks assembled to the chain, where the chain is constituted by one type of link plates. The link plate has two convex portions provided on one surface and two concave portions provided on the other surface, and the concave portions and convex portions are arranged so that their center positions coincide with each other. and 2
The two concave portions and convex portions are arranged at symmetrical positions with respect to the center of the link plate, and can fit into the convex portion and concave portion of a similar link plate other than the concave portion and the convex portion, respectively. The dimensions in between are such that a friction block can be inserted between them, and a chain is made by stacking multiple rows of such link plates and connecting them endlessly. A power transmission belt characterized in that the link plates in the rows are both arranged with their convex portions facing outward.